acl_extended_fd(3) [redhat man page]

ACL_EXTENDED_FD(3)					   BSD Library Functions Manual 					ACL_EXTENDED_FD(3)

NAME

     acl_extended_fd -- test for information in the ACL by file descriptor

LIBRARY

     Linux Access Control Lists library (libacl, -lacl).

SYNOPSIS

     #include <sys/types.h>
     #include <acl/libacl.h>

     int
     acl_extended_fd(int fd);

DESCRIPTION

     The acl_extended_fd() function returns 1 if the file identified by the argument fd is associated with an extended access ACL. The function
     returns 0 if the file does not have an extended access ACL.

     An extended ACL is an ACL that contains entries other than the three required entries of tag types ACL_USER_OBJ, ACL_GROUP_OBJ and ACL_OTHER.
     If the result of the acl_extended_fd() function for a file object is 0, then the ACL defines no discretionary access rights other than those
     already defined by the traditional file permission bits.

     Access to the file object may be further restricted by other mechanisms, such as Mandatory Access Control schemes. The access(2) system call
     can be used to check whether a given type of access to a file object would be granted.

RETURN VALUE

     If successful, the acl_extended_fd() function returns 1 if the file object identified by fd has an extended access ACL, and 0 if the file
     object identified by fd does not have an extended access ACL. Otherwise, the value -1 is returned and the global variable errno is set to
     indicate the error.

ERRORS

     If any of the following conditions occur, the acl_extended_fd() function returns -1 and sets errno to the corresponding value:

     [EBADF]		The fd argument is not a valid file descriptor.

     [ENOTSUP]		The file system on which the file identified by fd is located does not support ACLs, or ACLs are disabled.

STANDARDS

     This is a non-portable, Linux specific extension to the ACL manipulation functions defined in IEEE Std 1003.1e draft 17 ("POSIX.1e", aban-
     doned).

SEE ALSO

     access(2), acl_get_fd(3), acl(5)

AUTHOR

     Written by Andreas Gruenbacher <a.gruenbacher@computer.org>.

Linux ACL							  March 23, 2002							 Linux ACL

Check Out this Related Man Page

ACL_GET_FD(3)						   BSD Library Functions Manual 					     ACL_GET_FD(3)

NAME

     acl_get_fd -- get an ACL by file descriptor

LIBRARY

     Linux Access Control Lists library (libacl, -lacl).

SYNOPSIS

     #include <sys/types.h>
     #include <sys/acl.h>

     acl_t
     acl_get_fd(int fd);

DESCRIPTION

     The acl_get_fd() function retrieves the access ACL associated with the file referred to by fd.  The ACL is placed into working storage and
     acl_get_fd() returns a pointer to that storage.

     In order to read an ACL from an object, a process must have read access to the object's attributes.

     This function may cause memory to be allocated.  The caller should free any releasable memory, when the new ACL is no longer required, by
     calling acl_free(3) with the (void*)acl_t returned by acl_get_fd() as an argument.

RETURN VALUE

     Upon successful completion, this function shall return a pointer to the working storage.  Otherwise, a value of (acl_t)NULL shall be
     returned, and errno shall be set to indicate the error.

ERRORS

     If any of the following conditions occur, the acl_get_fd() function returns a value of (acl_t)NULL and sets errno to the corresponding value:

     [EBADF]		The fd argument is not a valid file descriptor.

     [ENOMEM]		The ACL working storage requires more memory than is allowed by the hardware or system-imposed memory management con-
			straints.

     [ENOTSUP]		The file system on which the file identified by fd is located does not support ACLs, or ACLs are disabled.

STANDARDS

     IEEE Std 1003.1e draft 17 ("POSIX.1e", abandoned)

SEE ALSO

     acl_free(3), acl_get_entry(3), acl_get_file(3), acl_set_fd(3), acl(5)

AUTHOR

     Derived from the FreeBSD manual pages written by Robert N M Watson <rwatson@FreeBSD.org>, and adapted for Linux by Andreas Gruenbacher
     <a.gruenbacher@computer.org>.

Linux ACL							  March 23, 2002							 Linux ACL

Linux and UNIX Man Pages

acl_extended_fd(3) [redhat man page]

Check Out this Related Man Page